What is so unique about Climawin Windows ?

As well as being high performance in purely thermal insulation terms, they are a ventilation system.

Not only that, in temperate or cooler climates (or seasons) such as central and coastal Europe, they perform as the key part of a heat recovery ventilation system, and a passive, healthy one at that.

In warmer areas or during cooling season, they can (with integrated blinds) help transmit daylight without bringing unwanted solar (heat) gains.


What is the difference between Climawin windows and Passive Windows which are already radically better than standard windows?

Passive windows (PWs) undoubtedly contribute to large energy savings. However they do not lead to a building reaching the Passive House (Passiv Haus) Standard on their own and  rely on the contribution of an heat recovery system to meet ventilation needs (any space for human occupation requires a supply of fresh healthy air) as well as other measures to do so.

The high performance aspect of PW is that they reduce the heat loss through the windows themselves significantly. However they still lose heat (the best window, including passive,  still loses at least 3 times the heat of an average wall).

Climawin windows are close in U Value (thermal insulation performance) to PWs but in addition to this work as a ventilation system that actually raises the temperature of the air entering through them. Climawin is capable of supplying 52% of the heat required to make the incoming air comfortable inside, on all facades (and  over 100% on southern facades). Overall, (i.e. for the whole building across the whole year), this results in a 20 to 20% improvement  (Denmark or Ireland)  in energy consumption.


How does the Climawin approach differ from the Passiv Haus / MHRV approach ?

Climawin is both a thermal window and a heat recovery system in one. As such it uses the room itself as the duct and is thus an inherently more cleanable and quieter arrangement than a fully ducted MHRV installation. It should also be cheaper while (especially with the addition of an air to water heat exchanger on the extraction system) approaching  MHRV in terms of overall heat energy recovered.


How much more energy will ‘smart’ windows save compared to Passive Windows?

They are more than a window so would need to be compared to a combination of PW and ventilation system to get a fair comparison. See next question,


How much will Climawin cost compared to standard or even passive windows ?

Perhaps 25% more than a passive window however when compared to the cost of passive windows and a separate heat recovery system (which, given Climawin is both in one, is a fairer comparison) they should be a similar price or even cheaper.


Do room sensors need to be installed in every room? How do they work?

Yes control sensors need to go in each room. They are a standard part that is proprietary to Climawin and are mounted on the ceiling. They monitor CO2 and RH (as well sometimes as interior temperature-this may be done at the window face also) and may control the room extraction system to have it only operate when Climawin is bringing air into the room.


Do the sensors operate through a remote control ?

Yes, wiring is not required as they communicate with the windows using radio frequency technology. There are now 2 power options either autonomous / wireless (powered by window integrated PV and battery but occasionally needing recharging), or wired into the rooms ACDC system.


Are there any other parts which would need to be replaced on a regular basis?



Are there any maintenance requirements? How often?

For the wired version there are no maintenance requirement. For the autonomous version occasional recharging (at most monthly or fortnightly depending on number of blind movement deployed) may be required. Glass can be cleaned from all sides.



How is Climawin sold?

Directly only in the immediate future, then via licenced producers (please get in touch if you are a manufacturer interested in this)